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Why use Sildenafil: Sildenafil is a treatment for adult men with erectile dysfunction, which is sometimes known as sexual impotence. Do not use sildenafil: if you are allergic to sildenafil or any other ingredients in this medicine if you are taking medicines called nitrates, as combining them may cause a serious drop in blood pressure. Tell your doctor if you are taking any of these medicines, which are often given to relieve angina (or "chest pain"). If you are unsure, ask your doctor or pharmacist. If you are using any medicines known as nitric oxide donors like amyl nitrite ("poppers"), combining them may also cause a serious drop in blood pressure. If you are taking riociguat. This medicine is used to treat pulmonary arterial hypertension (i.e., high blood pressure in the lungs) and chronic thromboembolic pulmonary hypertension. If you have a serious heart or liver problem. If you recently had a stroke or heart attack, or if you have low blood pressure. If you have some rare hereditary eye diseases (like retinitis pigmentosa). If you have previously experienced vision loss due to non-arteritic anterior ischemic optic neuropathy. Warnings and precautions: Talk to your doctor or pharmacist or nurse before taking sildenafil if you have sickle cell anemia (a disorder of red blood cells), leukemia (blood cancer), and multiple myeloma (bone marrow cancer). If you have a deformity of your penis or Peyronie's disease. If you have heart problems. Your doctor should carefully check whether your heart can handle the extra pressure of sexual activity. If you currently have a stomach ulcer or a bleeding problem (like hemophilia). If you experience sudden vision loss or loss, stop taking sildenafil and contact your doctor immediately. Sildenafil should not be used with any other treatments orally or topically for erectile dysfunction. Possible side effects: Stop using the product and seek immediate medical care if you experience throat tightness or swelling of the eyes, face, lips, or tongue, or if you feel faint or have difficulty breathing. Stop using the product if you experience hives or itching on the face or body. Other medicines and sildenafil: Tell your doctor or pharmacist if you are taking or have recently taken or might take any other medicines. Sildenafil tablets may interact with some medicines, especially those used to treat chest pain. In an emergency, you should tell your doctor or pharmacist or nurse that you have taken sildenafil and when. Do not take sildenafil with other medicines unless your doctor tells you it is okay. You should not take sildenafil if you are taking medicines called nitrates, as combining these medicines may cause a serious drop in blood pressure. Any medicines known as nitric oxide donors like amyl nitrite ("poppers") may also cause a serious drop in blood pressure. Riociguat. Medicines known as protease inhibitors, such as HIV treatment, may cause your doctor to start you on a lower dose (25 mg). Alpha blockers for high blood pressure or prostate enlargement may cause dizziness or lightheadedness, which may be due to a drop in blood pressure when sitting or standing up quickly. How to use sildenafil: Always take this medicine exactly as your doctor or pharmacist has told you. Consult your doctor or pharmacist if you are unsure. The recommended starting dose is 50 mg. Do not take sildenafil more than once a day. How to store sildenafil: Keep this medicine out of sight and reach of children. Do not store above 30°C. Do not use this medicine after the expiration date printed on the carton and blister after EXP. The expiration date refers to the last day of that month. Store in the original container to protect from moisture.